The state media's television report included footage of model Elham Arab, known for her portraits in wedding dresses, speaking before Tehran prosecutor Abbas Jafari Dowlatabadi in a conference room, her blonde hair hidden under a black chador.

"All people love beauty and fame," Arab said. "They would like to be seen, but it is important to know what price they will pay to be seen."

The report did not say what charges Arab faced, nor did it identify the other seven people arrested. It said police identified about 170 people in the operation through social media activity as being involved in modeling, including 58 models, 59 photographers and make-up artists.

It said those targeted saw their businesses shut down, as well as their pages on Instagram and Facebook removed.

"We must fight with enemy's actions in this area," Dowlatabadi was quoted by the state-owned IRAN newspaper as saying. "Of course our actions in this area will continue."

Spider II

The arrests were part of an undercover operation dubbed Spider II which targets photos of women without the head covering that has been mandatory in Iran for more than three decades.

The government of President Hassan Rouhani is not strict in enforcing the head covering rule, but hardliners in the country's police and judiciary consider exposed hair as un-Islamic.

In recent years, Iranian women in Tehran especially increasingly have worn the mandatory scarf loosely on their head, drawing the ire of conservatives in the Islamic Republic.

Tehran police chief General Hossein Sajedinia in April announced his department had deployed 7,000 male and female officers for a new plain clothes division - the largest such undercover assignment in memory - to enforce the government-mandated Islamic dress code.